1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * MIPI-DSI Samsung s6d16d0 panel driver. This is a 864x480 4 * AMOLED panel with a command-only DSI interface. 5 */ 6 7 #include <drm/drm_modes.h> 8 #include <drm/drm_mipi_dsi.h> 9 #include <drm/drm_panel.h> 10 11 #include <linux/gpio/consumer.h> 12 #include <linux/regulator/consumer.h> 13 #include <linux/delay.h> 14 #include <linux/module.h> 15 16 struct s6d16d0 { 17 struct device *dev; 18 struct drm_panel panel; 19 struct regulator *supply; 20 struct gpio_desc *reset_gpio; 21 }; 22 23 /* 24 * The timings are not very helpful as the display is used in 25 * command mode. 26 */ 27 static const struct drm_display_mode samsung_s6d16d0_mode = { 28 /* HS clock, (htotal*vtotal*vrefresh)/1000 */ 29 .clock = 420160, 30 .hdisplay = 864, 31 .hsync_start = 864 + 154, 32 .hsync_end = 864 + 154 + 16, 33 .htotal = 864 + 154 + 16 + 32, 34 .vdisplay = 480, 35 .vsync_start = 480 + 1, 36 .vsync_end = 480 + 1 + 1, 37 .vtotal = 480 + 1 + 1 + 1, 38 .width_mm = 84, 39 .height_mm = 48, 40 }; 41 42 static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel) 43 { 44 return container_of(panel, struct s6d16d0, panel); 45 } 46 47 static int s6d16d0_unprepare(struct drm_panel *panel) 48 { 49 struct s6d16d0 *s6 = panel_to_s6d16d0(panel); 50 struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev); 51 int ret; 52 53 /* Enter sleep mode */ 54 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 55 if (ret) { 56 dev_err(s6->dev, "failed to enter sleep mode (%d)\n", ret); 57 return ret; 58 } 59 60 /* Assert RESET */ 61 gpiod_set_value_cansleep(s6->reset_gpio, 1); 62 regulator_disable(s6->supply); 63 64 return 0; 65 } 66 67 static int s6d16d0_prepare(struct drm_panel *panel) 68 { 69 struct s6d16d0 *s6 = panel_to_s6d16d0(panel); 70 struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev); 71 int ret; 72 73 ret = regulator_enable(s6->supply); 74 if (ret) { 75 dev_err(s6->dev, "failed to enable supply (%d)\n", ret); 76 return ret; 77 } 78 79 /* Assert RESET */ 80 gpiod_set_value_cansleep(s6->reset_gpio, 1); 81 udelay(10); 82 /* De-assert RESET */ 83 gpiod_set_value_cansleep(s6->reset_gpio, 0); 84 msleep(120); 85 86 /* Enabe tearing mode: send TE (tearing effect) at VBLANK */ 87 ret = mipi_dsi_dcs_set_tear_on(dsi, 88 MIPI_DSI_DCS_TEAR_MODE_VBLANK); 89 if (ret) { 90 dev_err(s6->dev, "failed to enable vblank TE (%d)\n", ret); 91 goto err_power_off; 92 } 93 /* Exit sleep mode and power on */ 94 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 95 if (ret) { 96 dev_err(s6->dev, "failed to exit sleep mode (%d)\n", ret); 97 goto err_power_off; 98 } 99 100 return 0; 101 102 err_power_off: 103 gpiod_set_value_cansleep(s6->reset_gpio, 1); 104 regulator_disable(s6->supply); 105 106 return ret; 107 } 108 109 static int s6d16d0_enable(struct drm_panel *panel) 110 { 111 struct s6d16d0 *s6 = panel_to_s6d16d0(panel); 112 struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev); 113 int ret; 114 115 ret = mipi_dsi_dcs_set_display_on(dsi); 116 if (ret) { 117 dev_err(s6->dev, "failed to turn display on (%d)\n", ret); 118 return ret; 119 } 120 121 return 0; 122 } 123 124 static int s6d16d0_disable(struct drm_panel *panel) 125 { 126 struct s6d16d0 *s6 = panel_to_s6d16d0(panel); 127 struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev); 128 int ret; 129 130 ret = mipi_dsi_dcs_set_display_off(dsi); 131 if (ret) { 132 dev_err(s6->dev, "failed to turn display off (%d)\n", ret); 133 return ret; 134 } 135 136 return 0; 137 } 138 139 static int s6d16d0_get_modes(struct drm_panel *panel, 140 struct drm_connector *connector) 141 { 142 struct drm_display_mode *mode; 143 144 mode = drm_mode_duplicate(connector->dev, &samsung_s6d16d0_mode); 145 if (!mode) { 146 dev_err(panel->dev, "bad mode or failed to add mode\n"); 147 return -EINVAL; 148 } 149 drm_mode_set_name(mode); 150 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 151 152 connector->display_info.width_mm = mode->width_mm; 153 connector->display_info.height_mm = mode->height_mm; 154 155 drm_mode_probed_add(connector, mode); 156 157 return 1; /* Number of modes */ 158 } 159 160 static const struct drm_panel_funcs s6d16d0_drm_funcs = { 161 .disable = s6d16d0_disable, 162 .unprepare = s6d16d0_unprepare, 163 .prepare = s6d16d0_prepare, 164 .enable = s6d16d0_enable, 165 .get_modes = s6d16d0_get_modes, 166 }; 167 168 static int s6d16d0_probe(struct mipi_dsi_device *dsi) 169 { 170 struct device *dev = &dsi->dev; 171 struct s6d16d0 *s6; 172 int ret; 173 174 s6 = devm_drm_panel_alloc(dev, struct s6d16d0, panel, 175 &s6d16d0_drm_funcs, 176 DRM_MODE_CONNECTOR_DSI); 177 if (IS_ERR(s6)) 178 return PTR_ERR(s6); 179 180 mipi_dsi_set_drvdata(dsi, s6); 181 s6->dev = dev; 182 183 dsi->lanes = 2; 184 dsi->format = MIPI_DSI_FMT_RGB888; 185 dsi->hs_rate = 420160000; 186 dsi->lp_rate = 19200000; 187 /* 188 * This display uses command mode so no MIPI_DSI_MODE_VIDEO 189 * or MIPI_DSI_MODE_VIDEO_SYNC_PULSE 190 * 191 * As we only send commands we do not need to be continuously 192 * clocked. 193 */ 194 dsi->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS; 195 196 s6->supply = devm_regulator_get(dev, "vdd1"); 197 if (IS_ERR(s6->supply)) 198 return PTR_ERR(s6->supply); 199 200 /* This asserts RESET by default */ 201 s6->reset_gpio = devm_gpiod_get_optional(dev, "reset", 202 GPIOD_OUT_HIGH); 203 if (IS_ERR(s6->reset_gpio)) { 204 ret = PTR_ERR(s6->reset_gpio); 205 if (ret != -EPROBE_DEFER) 206 dev_err(dev, "failed to request GPIO (%d)\n", ret); 207 return ret; 208 } 209 210 drm_panel_add(&s6->panel); 211 212 ret = mipi_dsi_attach(dsi); 213 if (ret < 0) 214 drm_panel_remove(&s6->panel); 215 216 return ret; 217 } 218 219 static void s6d16d0_remove(struct mipi_dsi_device *dsi) 220 { 221 struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi); 222 223 mipi_dsi_detach(dsi); 224 drm_panel_remove(&s6->panel); 225 } 226 227 static const struct of_device_id s6d16d0_of_match[] = { 228 { .compatible = "samsung,s6d16d0" }, 229 { } 230 }; 231 MODULE_DEVICE_TABLE(of, s6d16d0_of_match); 232 233 static struct mipi_dsi_driver s6d16d0_driver = { 234 .probe = s6d16d0_probe, 235 .remove = s6d16d0_remove, 236 .driver = { 237 .name = "panel-samsung-s6d16d0", 238 .of_match_table = s6d16d0_of_match, 239 }, 240 }; 241 module_mipi_dsi_driver(s6d16d0_driver); 242 243 MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>"); 244 MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver"); 245 MODULE_LICENSE("GPL v2"); 246